calculating losses power

[mhalarjani]

Hi everybody

I have question about :
If I have mv feeder 13.8 kv trip for 4 hours and there is more than 400 customer on that feeder
How can calculate losses of money due to that outage.

 

[jraef]

Look at a historical record of a similar 4 hour period on a similar day, similar temperature etc. and assume it's fairly similar to that.


"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington

 

[ScottyUK]

Do you mean lost revenue for the power which was not delivered, or the cost to the businesses unable to operate without power?

 

[mhalarjani]

Thanx alot of u

I mean the lost revenue for the power which was not delivered,

 

[crshears]

Like jraef said, you need to compare the day in question with case data from as similar a normal day as you can find data for to determine a reasonable load profile for that feeder had the load loss not occurred.

Once you have that in hand you wil have to apply pricing to those [lost] sales based on whatever method your utility uses to calculate both your cost to purchase that bulk power and what retail price would have been charged to your customers.

Then do the math.

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

 

[davidbeach]

You also need to compare the first hour or two following the outage against the baseline. Some loads will have been lost (lighting), some load will have mostly time shifted (heating, cooling). Other loads will be a mix of partially recovered and partially lost. Any answer will be very inexact.

 

[crshears]

Agreed as far as cold load pick-up goes, davidbeach; although, provided the information's available, at least some of the inexactitude could be eliminated by choosing savecase data for the same time period of the day, same day of the week, in the same season, with about the same weather, and so on...although as I think on it any improvements or downturns in the local economy could also throw the figures off.

There's a reason somebody once came up with the term "guesstimate..."

CR

"As iron sharpens iron, so one person sharpens another." [Proverbs 27:17, NIV]

 

[racookpe1978]

The "comparison day" needs to be the same day of the week, if at all possible. In no circumstances can a weekend be directly compared to a Saturday or Sunday (or holiday), even if the same "date" of April 15 is compared from one year to the next.

Weather is more important than individual day-of-week though. Any Monday at 32 degrees high is going to be very, very different than any Monday at 92 degrees. A Thursday of 36 in February or December is likely pretty close to that Monday at 32 degrees in April though. Make sense?